INFICON Cygnus 2 Thin Film Deposition Controller - Manual (Page 22)

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Cygnus 2 Operating Manual
1.2.3 Earth Ground
The Cygnus 2 is connected to earth ground through a sealed three-core
(three-conductor) power cable, which must be plugged into a socket outlet with a
protective earth terminal. Extension cables must always have three conductors
including a protective earth terminal.
WARNING - Risk Of Electric Shock
Never interrupt the protective earth circuit.
Any interruption of the protective earth circuit inside or
outside the Cygnus 2, or disconnection of the protective
earth terminal is likely to make the Cygnus 2 dangerous.
This symbol indicates where the protective earth ground
is connected inside the Cygnus 2. Never unscrew or
loosen this connection.